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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0078031d00b7e97edde99299aa6bef365aca1f4dfb1d90db801ff0a9d594bf' 
  AND token = '7osuLSd6l3vAbLTdSNYKeYDdp0fiIy2vdawwI+a0FII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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