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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c971502010d20f8f95407f0340bce522eb167749bc5ceb6af68058218eabb85d' 
  AND token = 'EvkhJ0F2Anu49FCkmVmF7BhWoKFauVciYfPGxuBZ7O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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