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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13929765d7cd0f81cb478fdcab0174c4c068e4571a69cb3b0f307d90fca4d78' 
  AND token = 'oVA4l4v9gkwMfJ5yqp1yfRSS7LEmMK3tEe7Um/+yxyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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