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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea95b9b137cafb23aaee5d3a3d99dd95619c352f74520c145dffaee3035b59a' 
  AND token = 'DbSaXY82xSODE10TPvnOlXWbdKEdjJ7/4V2ETqKxm7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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