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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfc51bf6f685a1029cf8c0dcf8f8d6e81c7c5b0c9af93d0d03c7f32847be4f1' 
  AND token = '9AiR140RujIgu/GEaAOPqHWqFDwpPJiepHGXr583sFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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