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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e1fba225ae52d3755648117a0cdceb546f6cbfa2187c10f47b31cd014bce82' 
  AND token = 'rQ3tkq1if27icVI4RCzRQ8q0bK/UImQyRsVuZSPx/o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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