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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e78b0bdb6d519e55974f1b9f7724824b04dc2d99ebdb3ac406c3c947a0b8af' 
  AND token = 'T+szemi2bJE7D38x4nL8DbfWJtbacTdRio9b2VPYgVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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