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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193d84decf46273ee7272fc8bdd91afb8c66ea1a03b727e78437c1ca59330721' 
  AND token = 'Nb6Q2hhtwe64elW6eIicTkRybO1a7lKvI0EFlGLUYPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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