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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e17721b8de58bc1c236ee41572bb5cc36f69ea250ad2f5ee5944e97635d30' 
  AND token = 'mLbjhAEiI2tFfWU4o6llHMdHuy3/plDNYPBWY8YaSeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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