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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a9a438af18e61a2a8c858eeaa24db9c5c85eee857da79d8ec0ce19e58f2d8e' 
  AND token = 'hQ1DVKsewk1f4aaleJeSqE4sjTSmYm1q7lxvfM21wy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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