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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a00f9caf1a4e49090ce9214e393e63eaf424980342e21dd8edc21a92776a58c' 
  AND token = 'KP0Tz4zr9IAegaSP1oLl8VZGj9BGcTeBucEQeqNt2d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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