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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae697ab60276b52edf9a0b71448a6b2424ed7a047e160ac7db71497df48693a3' 
  AND token = 'Uh+tBLFx0n0vUYRz1ecOMSenDKo6s+lCBc4HcPOB7RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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