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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d34a84009fb362799b753e104cb0dc79c97a3d01d6047360332e0697691df4' 
  AND token = 'kMcKGNlS8Yi0SHt0z9BU32L682cPoFNoakRFMmRxy+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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