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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cc33cca55d1a06d20bd9bda67786d9b0c356fe847c90eee8f66aa53c654af8' 
  AND token = 'OhRG6otopsWYDAjcEvbmuARgmHt9D+dylWKHq58nw/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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