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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d1a932cfcd650de420137e19780bb1c63ffa30a93652be2686f590f04e9154' 
  AND token = 'JrWhNMXd0SBkamguahqOmYHCNfnzW3id9G7rNAD4o6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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