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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee2e72254e48188f2de74755c276df67c1dc11d38542caf68c5f1fafe28602f' 
  AND token = 'zoXkLKWllbkViynm9ExZOdblAdx9x3lksXAksXCo4no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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