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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa8aa628460081993a4048acaa185c1537a2091582f18ed80005f791f6a007c' 
  AND token = 'EPDCFbfDFXB8144+MyDPFzR5i6m5ZfQ79lJMflSfEM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}