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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3365f68951765689046d0cac5f15aa026332e5ad05fbaf6c49ac4f87d3462d59' 
  AND token = 'PsM86ofOAqfr4w44Eu7PbCxTTOBWbEfkzL7ACi1rEvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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