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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e417d65e71a3fbd489772879ce81d348a80b0ad0cf803dcbafeb32dbef935149' 
  AND token = 'tElt5I6JvCr0IugqnC2m/i3ewMI5s7Wt2MRWoWM7P3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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