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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d19c8d64dd32c629e5339fd13c84c91b2eccfbc4fefbdf05f28bc6146d6d080' 
  AND token = 'X12R+P6S6gYXlJ1gCLtTGXkbO3n8Ih6iJK4y+6qfS2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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