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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f802f67f53b569c6f51b80a0910da9dc48e2864ac084b6624df96a6e6da7e21d' 
  AND token = 'WJD0PYdhRtNCWpPslUVmXpN6zR3c+pi9Y0BiueQOYRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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