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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f6cad132e116e2d88f9a55e5ab5833c15dd90508195848d6a8e440d4f285db' 
  AND token = 'J8RwEkKGwwskm1+AflnApkAkp8OJZbKsxhY/GaVY1Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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