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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84ed2f79bde7220b0bd0e86c77707c884d28aac82defd4c74bef0e3ea6eea0b' 
  AND token = 'fWplPTUF1BlqPel0yPXnp3F3dabrqn1lv5L9HHbR9q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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