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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13893b0e8a98ce1f694534a86212000e6b83f0eaa78767442d16ee78ff178f61' 
  AND token = 'wb8PtawQNTbINT2eQBcJ+JoN8qrFup1k5gY81a4sXt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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