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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc91fc7e0ebf4dd4f0ddca42f0656e3d1e7d62510440171f93c8b0aca6e29c4' 
  AND token = 'J4gbKNRiN0h2lsfWycpR32EfaoTDl3XYdDRDbuJl9B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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