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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a614814697076e35b80398f0c2c62d7f7e55b2932cc8bf2bc0f5add76928f2b1' 
  AND token = 'emreS/xkXnLXOWOf/sWAFrtFBTQIt2KDqM23BmyXXYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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