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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15916e5bcd217b3dded1da2c3f260d36c49cbc1dcc1139ab8b4f28cd3b7b16ae' 
  AND token = 'ryHwMWuPC/HbS2VgiFH3SBnaKDdvIbb00jGX6gnhLcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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