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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2a88904506820d4b3145af0029eeb40c3ca9f1403df0d4fdafbc7291efb4b8' 
  AND token = '7l/Ty8cY5Gi1xrEDZ43vMsuWJUMWh5tl03Hw0N2lr6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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