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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a07628436936d844427b150e7d0e55b2773075fe5e6ce9a1d732e1caf5caf93' 
  AND token = '6xf5Cr1q33kzKLP+CPEWKLRCN/PLj21a5+Lner3nnC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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