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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2074e7d947884cafc20cb77d5f89f6e27bb01c884f42164bb6373e78f7ff847f' 
  AND token = 'Wj68KCsEkXT5kqyTEm/OFb2DrXX2LwnChdn+6oqjvBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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