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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67a06043dcb7c4d7102834ec286efab82085b201dfd64aba44ff19e9cfe9431' 
  AND token = '3GoCml3oebT7hdKXD1uC0PxN2/7Kq4A/HWeNG/DnbqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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