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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9254afaf769b64d636666039ff1c70d409f0fdc74fac2f1e08b2edf6b056f8e1' 
  AND token = 'ehqmiOS5OfV3W6BPWyiYRJ/q1Qm/MuXQ4su0enxIrgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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