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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbebb0b2cca488e923b0761d110aaf156ff9b0017ee81671d7c3501b1889d985' 
  AND token = '72ZMaklXMGLryfwaiOyZ31196BqAPu3thRxmJVVck4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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