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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4d9d9df0303e64b5619bb9ed3c38b053d733eb7923bbbf69c9dfdb96098897' 
  AND token = 'T/DaK2ko/IQuFfpVj50Z6L3iAftITG9JNnp9gwoDWW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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