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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b102ed14125e2da2172324697259f92fad235d142eb0065bc05aa66ac1d253' 
  AND token = 'pT+HtTci8loD9L8nVTKKLyQftgRztzkS+5ZPSzgVYg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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