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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c2eabbcb79bca984309f68791e7bf29cd5162a639fdb9860536e03266a60fd' 
  AND token = 'Y2e1oV1emz3w6yzj7TMolY2IwoAUNrXN5kqdK/EWYNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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