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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a03f7f4966b60c81699aa49ff52d35a4962bdb923e8de24c24806bea707423' 
  AND token = 'G8rbLpyiM+biSST+MIj6qQKC8NdQZSPR1dUuiaot7Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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