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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f4ca7c425ab19c90cd11cbbaf9190624f5c70cc4ae5bd219bf7eaacaf1fa49' 
  AND token = 'Z+b302NGY4Pkwv8JiBiN4PVITXM7386yOzj5YplseJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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