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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469b8e93c6aca8cbb0c03194eeae8c31b477c877833783624d03c47f8152bbd0' 
  AND token = 'nJAxlvWTmXVtPrr5gaHBAGlQlCX0fESjB5tA/Hi2X8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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