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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee67e81221879a97858ccb4075cc320efdfc5582c88eaa5e656f3f9b6d336f43' 
  AND token = 'RIAt6599IrmpW8OGPhnAPZ8S7i5UQV/ueQfBf56+ncs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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