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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8239aa03d1d4c91b5125688b78a69f7cb3a423d086ea3e98940b69fa89888d1e' 
  AND token = 'x31dzdvHGOjtJ2+6eX4dU6nPGCzR8v4ry56Ie+Fb8Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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