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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc3470c1492a27be54ab9b051dbae5944055082bfc6a0ddfe6df1e67569cf47' 
  AND token = 'OsNhtg+flH0HpWlUeGMalsNef192/zjOMnT1X7E8Pdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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