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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e2c0a1110c533049ae0b34ed2b218eff656636fc38af308e042de350b3c0d4' 
  AND token = '1hYtZC8TVPKWSxvvuAFNaum0hbb/mP0Ivpg+JVR/ODA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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