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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513f069cfc57c548e49d59a31ce4397d0e3fe05a210f64b71fd1614e8d44ffcc' 
  AND token = '5s9U4K5HYPufEP4/l4BwBCdiVS/VHWHOc0e8KvdiAl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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