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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0f9462bfe0a847a59a0752d02efee4fdf5e972ec6fab3dadc068f527618651' 
  AND token = 'pJ+yvhVamc30SrdiqqwaeAh/B7D4pf79nQrJnelzbME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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