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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20096648506deb7f4e23bab86132cd21895cce1b968c1fa6e3b0e14f891dbf06' 
  AND token = '+2IafKmMGk3An9U2T1yWds0EfYgI5ueiY12fjNETuM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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