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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920f0e5ddb125460458789d4a599e75d0506f8e8020d288396e44ce794d77e28' 
  AND token = '1CRh6P5NCTKXG2tw/U3XX+20x4vfWHLXNVc953x//RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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