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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704aea9978ffd21e15fdce49cf8071a280bf71125e0080c218d0a15572ca9bf' 
  AND token = 'JCeXolFcHBjkmzwFSCI8qqSdjiK/aj0Bm8ZAReepGeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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