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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4151a8a97ee6612bd882d155b1cd0722bb58aff49c8aa1bc79441c2d65517ec6' 
  AND token = 'RVtXO44nt8of/h4TdNu1MyfBHvpu7596kx3WKizTDqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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