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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f003765c79ea4aea5df0844b07ef7f81333a77a67d47be02342ef9ef7d125cda' 
  AND token = '5qi7yT7nsvXbdnflmvXP6jeAiBAJT657gOiRAGHLgCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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