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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95986e79237b57b9496a682d553be4892edfbe80319406235fb314026ef4609' 
  AND token = 'VevO7dSuBCX3S1yNkxzv+oC+lNVtDRv2/elKSRH3l7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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