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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a2574c8aa34ea0d96e2e4917c19bacd67c680b19a278d46bb926fe763be4d4' 
  AND token = 'CoQkX5Of908KIcHGDP/2yVwulR9KRYNEVY0EyqnOL9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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