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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96948d4ce4fff404d262bf86f6e14045564ae52974e8c7115bbf98dc6f530b43' 
  AND token = 'xCq8HnAi1a0x/5/9fyTmXfACcB5GrnJMo7xL+Y6obLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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