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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ae3d4ec75e392cd12a675eb843dc24552ca7d90fbdd4914d3017d7bed5fdfb' 
  AND token = 'bcGMsagGkbuINK7PTjanfEPY7hbq33KVb5pLZ4Oxv5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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