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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22bfc680be1985f455887a1471388c5a9d4088b8872e5b64c1c8160515d167e6' 
  AND token = 'e2v3nhr3j6uARIlJzKdHHpSGz0y+GTWdDruJu1WOvB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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