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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582677b2973fc36226afb04d8606b0eb6d333ea6568ef980f799d3f44ed219c9' 
  AND token = 'pA309C/2g0XjICQOW4VpWOR1Vm72/WSBDjl0bR9QgR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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